25LC1024 datasheet(15/34 Pages) MICROCHIP

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DS22064D-page 15

25LC1024

2.9

SECTOR ERASE

The Sector Erase function will erase all bits (FFh)

inside the given sector. A Write Enable (WREN) instruc-

tion must be given prior to attempting a Sector Erase.

This is done by setting CS low and then clocking out

the proper instruction into the 25LC1024. After all eight

bits of the instruction are transmitted, the CS must be

brought high to set the write enable latch.

The Sector Erase function is entered by driving CS

low, followed by the instruction code (Figure 2-9), and

three address bytes. Any address inside the sector to

be erased is a valid address.

CS must then be driven high after the last bit if the

address or the Sector Erase will not execute. Once the

CS is driven high, the self-timed Sector Erase cycle is

started. The WIP bit in the STATUS register can be

read to determine when the Sector Erase cycle is

complete.

If a SECTOR ERASE instruction is given to an address

that has been protected by the Block Protect bits (BP0,

BP1) then the sequence will be aborted and no erase

will occur.

See Table 2-3 for Sector Addressing.

FIGURE 2-9:

SECTOR ERASE SEQUENCE

SCK

23456789 10 11

29 30 31

23 22 21 20

210

Instruction

24-bit Address

High-Impedance

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